We are excited to announce the availability of a visual search index on top of the Yahoo! 100M CC-licensed Flickr images corpus. This search index enables the fast execution of visual similarity search queries, i.e. given an arbitrary input image, it will return the most visually similar images out of the 100M images of the corpus.

We make publicly and freely available the first sentiment lexicon for Greek. The need for such a lexicon stemmed from our experimentation with both supervised and unsupervised (i.e. lexicon-based) sentiment analysis methods and our conclusion that combining both approaches can considerably improve the sentiment detection accuracy (see Tsakalidis et al., 2014).

Overview: This page provides pointers to the dataset, challenge definitions, ground truth challenge results and corresponding evaluation script that were created and used in the 2014 edition of the Social Event Detection (SED) task of the MediaEval benchmarking activity.

Overview: This page makes available for research purposes the dataset, challenge definitions, ground truth challenge results and corresponding evaluation script that were created and used in the 2013 edition of the Social Event Detection (SED) task of the MediaEval benchmarking activity. To be more concise, by social events, we mean events that are planned by people, attended by people and that the media illustrating the events are captured by people.

Overview: This page makes available for research purposes the dataset, challenge definitions, ground truth challenge results and corresponding evaluation script that were created and used in the 2012 edition of the Social Event Detection (SED) task of the MediaEval international benchmarking activity.